Bluetooth: short-range, low-power device links

Bluetooth is designed for short-range, low-power connections between nearby devices, typically within about 10 metres. Think of it as a cable replacement: it links peripherals like wireless keyboards, mice, headsets, or fitness sensors to your computer or phone. In contrast, Wi-Fi is built for higher-bandwidth tasks such as browsing the web, streaming video, or sharing files across a local network. The core difference is purpose: Bluetooth connects devices to each other, while Wi-Fi connects devices to a network and the internet.

To avoid mixing them up, remember that Bluetooth does not need a router or internet connection to work—it creates a direct link between two devices. If a question describes a scenario where a user wants to transfer a large file between two laptops, Wi-Fi (or a cable) is the better choice, not Bluetooth. Another trick: Bluetooth uses less power, so it's ideal for battery-powered gadgets like wireless earbuds or smartwatches. If the task involves streaming high-definition video or gaming online, Wi-Fi is almost always the correct answer.

A quick way to test yourself: ask whether the task requires internet access or just device-to-device communication. If it's the latter and the range is short, pick Bluetooth. If it's about getting online or moving lots of data, pick Wi-Fi. This simple check will steer you right in most exam questions.